EP1452722B1 - Intake manifold particularly for combustion engine - Google Patents

Description

The present invention relates to an intake manifold, in particular for internal combustion engines according to the preamble of claim 1.

The known intake manifold of this type consist of a number of channels, which corresponds to the number of cylinders to be fed with air of the engine. For connection with the cylinders, each channel was to be lined up with the other and, accordingly, the ducts of the intake manifold were connected to a so-called "plenum" or air chamber according to a juxtaposed arrangement of the individual channels. However, this arrangement compromised the uniform removal of air from the plenum by an improperly distributed flow of air, e.g. between an outer and an inner channel of the adjacent arrangement and therefore at non-uniform air volumes and - speeds. The distribution of the channels of the intake manifold according to a substantially two-dimensional course also claimed a considerable space and therefore a lot of space and had a non-optimal design of the plenum result.

Although these problems have so far been recognized, they have not been adequately eliminated, probably because the way in which the channels are located at the exit of the plenum in combination with the formation of the intake manifold to be designed has probably not been found.

The object of the present invention is therefore to propose eliminating the drawbacks of the conventional type intake manifold and an intake manifold which makes the air speed and amount in the intake manifold passages as uniform as possible so that the air distribution in the various passages substantially for each engine cylinder is identical. Another object is to reduce the footprint of the intake manifold so that the space requirement of the plenum can be reduced to a maximum.

These objects are achieved by an intake manifold with the characterizing features of claim 1.

If the axes of at least two contiguous channels at the exit from the plenum knee-like arranged with the curvatures in two mutually inclined planes, the two channels can be arranged with the axes in a plane superimposed, which is perpendicular to the plane in which the axes the adjacent channels are before entering the cylinder.

In document 1 ( US 4 577 596 A ) discloses an intake manifold for a V-type internal combustion engine having two banks of cylinders and a plurality of cylinder intake ports, comprising an air intake port, two supply pipes connected to the intake port, arranged substantially "U" -shaped and substantially above and parallel to a bank of cylinders are a plurality of branched tubes formed longitudinally along each delivery tube and extending vertically through the engine having an opening and substantially to the delivery tubes, the indicated tubes being arranged such that at least two of them branch off from the same Supply pipe extending tubes are aligned vertically with the top of the other with the supply pipe along a plane perpendicular to the feed pipe and for a portion of its length extending from the supply pipe, and means for connecting each opening end of the branched pipe with a Cylinder inlet opening on an opposite side of the machine on the opposite side of the machine from the supply pipe to which the branched pipe is connected.

In document 1, the transition from the abutting position to those superimposed in a version with half-shells of the intake manifold to be welded together is obtained, one of the half-shells of one of the channels being curved in a knee-bow shape, with a curvature in a plane inclined to the plane the curvature of a knee arch of the half shell of the other channel is to be in a common half-shell to end. The half-shell of the first channel and that of the second channel are closed by the common half-shell with the interposition of an insert having a partition which simultaneously forms the ceiling of one of the channels and the continuation of the half-shell of the other channel in the common half-shell. The insert is also designed such that its walls unite the walls of the half-shells of the first and second channels, so that two channels of constant and equal cross-section are obtained in the two channels themselves.

Figur 1

schematisch einen Ansaugkrümmer herkömmlicher Art, im Querschnitt;

Figur 2

schematisch einen Ansaugkrümmer gemäß der Erfindung, im Querschnitt;

Figur 3

ein Explosionsteilschaubild eines erfindungsgemäßen Ansaugkrümmers mit Plenum;

Figur 4

ein Teilschaubild der unteren, erfindungsgemäßen Halbschalen eines Ansaugkrümmers mit Plenum; und

Figur 5

ein Teilschaubild eines erfindungsgemäßen Ansaugkrümmers mit Plenum.

Further details and features will become apparent from the following description of a därgestellten in the accompanying drawings embodiment. Show it:

FIG. 1

schematically an intake manifold of conventional type, in cross section;

FIG. 2

schematically an intake manifold according to the invention, in cross section;

FIG. 3

a partial explosion diagram of an intake manifold according to the invention with plenum;

FIG. 4

a partial diagram of the lower, inventive half-shells of an intake manifold with plenum; and

FIG. 5

a partial diagram of an intake manifold according to the invention with plenum.

In FIG. 1 Reference numerals 1, 2, 3 and 4 show four ducts of a conventional intake manifold in which the four ducts are adjacent to each other, both in connection with the cylinders of an internal combustion engine and at the exit of a plenum FIG. 1 6 schematically indicates the mounting flange of the throttle valve.

In FIG. 2 On the other hand, according to the invention, superimposed channels 7 and 8 are shown, which come from a plenum 9 or a plenum chamber, whose lid 10 is provided with said mounting flange 6 and is to be assembled with a trough 11.

The intake manifold 5 is formed of half-shells 12, which in the transition region between a juxtaposed arrangement and a superimposed arrangement of the channels 1, 2 and 3 each have two stages 13 which are directed downwards and the tread surface outwards and step height in a second Level 14 and a continuation 15 ends.

A separating insert 16 is provided with a bottom 17, from the sides of which in each case one on the tread surface of the step 13 for abutment coming rib 18, one on the continuation 15 for abutment coming web 19 and a rib 20 extend to a recess directed, which is formed from a first stage 21 of a lower half-shell of the channel 2 (or 3). The step height of a second step 22 of the half shell itself finally abuts on the lower side of the tread surface of the step 14.

In the transition region between the adjacent arrangement and those superimposed of the channels, the half-shell of the channel 1 goes directly into knee elbows 23 and 24 of the ribs 18 of the insert 16, whose bottom forms the lid 26 of the lower half-shell of the channel 2 (3).

The knee-bow-like configuration of the edges of the insert 16 allows convenient vibration welding both with the lower half shell of one of the channels and with the upper half shell of the other channel.

Claims (5)

1. Intake manifold, particularly for internal combustion engines, comprising a number of ducts connecting a plenum chamber with a corresponding number of motor cylinders, each duct being formed by two half-shells, characterised by the fact that the transition from the side by side position to the superimposed position is realised in such a way that one of the half-shells of one (2; 3) of the ducts (1; 2; 3; 4) is bent as an elbow with a curvature in a plane inclined with respect to a plane in which lies the curvature of an elbow of the half-shell of the other duct (1; 4), to end up in a common half-shell, the half-shell of the first duct, the half-shell of the second duct and the common half-shell being complementary half-shells with interposition of an insert (16) having a dividing wall (17) forming, in the common half-shell, both the roof of one (2, 3) of the ducts and the prosecution of the half-shell of the other duct (1; 4).
2. Intake manifold according to claim 1, characterised by the fact that the insert (16) is structured in such a way that its walls (18) match the walls of the half-shells of the first and second ducts so as to provide two ducts of constant and equal cross-section.
3. Manifold according to claim 2, characterised by the fact of being formed from an upper half-shell of a duct (1, 2) and a lower half-shell of another conduct (3, 4) superimposed to the former, said half-shells respectively having, at their free edges, step-like formations matching with each other by interposing the separating insert (16) having a bottom from which raised portions (18) and ribs (19), predisposed to be housed within the recesses defined by the step-like formations, laterally extend.
4. Manifold according to claim3, characterised by the fact that, in the link portion between the side by side arrangement and the superimposed arrangement of the ducts, the half-shell of one of the ducts (1, 4) passes directly in elbows (23, 24) of the raised portions (18) of the insert (16), the bottom of which forms the top (26) of the lower half-shell of the other duct (2; 3).
5. Manifold according to one of the preceding claims, characterised in that the half-shells of the ducts and respectively the half-shells and the separating inserts are welded together, particularly by vibration welding.

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